L.R.
Hi L.!
I dont know if Memorial park is far away from you, but it has a pretty nice playground, also try www.meetup.com and look for Luna Mom Memorial is a group of moms and babies, and there are more groups! for sure you will find one that will fit your needs.
Another option is Discovery Green in downtown, it has a water playgound and a lots of fun, this coming Ago 9 (10:30 am), FREE Gymboree class at Discovery Green!check the link for directions http://www.discoverygreen.com/
You can also try your nearest public libary, some have storytime and is fun! http://www.hpl.lib.tx.us/branches/index.html
Good Luck and have Fun!